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The goal of this work is to design not a full state interval observer for singular fractional-order systems, but to design an observer for state functions of this kind of systems. Conditions for the existence of such functional interval observers are given and an effective algorithm for computing unknown observer matrices is provided in this study. Two numerical examples and simulation results are provided to illustrate the effectiveness of the proposed design method.<\/jats:p>","DOI":"10.1177\/0142331220944897","type":"journal-article","created":{"date-parts":[[2020,8,6]],"date-time":"2020-08-06T05:28:38Z","timestamp":1596691718000},"page":"567-578","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":5,"title":["Functional interval observer design for singular fractional-order systems with disturbances"],"prefix":"10.1177","volume":"43","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-2028-3784","authenticated-orcid":false,"given":"Dinh Cong","family":"Huong","sequence":"first","affiliation":[{"name":"Department for Management of Science and Technology Development, Ton Duc Thang University, Ho Chi Minh City, Vietnam"},{"name":"Faculty of Mathematics and Statistics, Ton Duc Thang University, Ho Chi Minh City, Vietnam"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Dao Thi Hai","family":"Yen","sequence":"additional","affiliation":[{"name":"Department of Sciences, Phuyen University, Tuyhoa City, 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